arc charge

A charging screen that fills the whole window, made of one WebGL2 shader and one big number. At rest a dim 4 % sits over a faint red thread between two contacts and a 24-tick level scale. A spark flares on the left contact, the camera pushes in and chases it along the thread as it ignites into an arc, with dust streaking past; it hits the right contact in a flash and the camera pulls back to the wide shot. Then the number counts up and the arc changes with the level: a thin amber filament at low charge, a jittering blue arc with side filaments peeling off in the middle, a wild violet-white arc throwing sparks near full. At 100 % it straightens into a calm mint-white beam with an anamorphic flare, the ticks fill in the same colour, and the level drains back to 4 % to loop. It plays as an 8-second seamless loop at any window size and keeps the scene centred on the shorter side. The colours by level, every timing and the arc's shape are a few named constants. Every frame is a pure function of time, with window.__render(t) and a ?rec mode for frame-exact video export; reduced motion shows one still of the full beam. The font is local, so it runs offline.